InChI=1S/C21H20O15S/c22-5-14-17(29)21(36-37(31,32)33)18(30)20(35-14)16-11(27)3-10(26)15-12(28)4-13(34-19(15)16)6-1-8(24)9(25)2-7(6)23/h1-4,14,17-18,20-27,29-30H,5H2,(H,31,32,33)